[KongchangAI]
Unverified85% confidenceTradeoffTime unknown

珠子大小与教育功能存在权衡:大珠安全易抓握但缺乏精细动作挑战,小珠锻炼手眼协调但误吞风险高,2-3岁选大珠、4岁后逐步过渡小珠是安全与发展的平衡点

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